A novel approach to polarization data analysis and its implications regarding cathodic protection system design and performance
- Florida Atlantic Univ., Boca Raton, FL (United States)
Experiments were performed whereby steel cathodes were cathodically polarized in natural sea water by galvanic coupling to an aluminum anode through an external resistor. The change in potential versus current density data with time was found to be linear with a slope equal to the product of the total circuit resistance and cathode surface area and with the vertical intercept corresponding to the anode corrosion potential. Based upon the data from these experiments and comparison with survey results from an instrumented offshore structure, it is projected that the potential-current density behavior of galvanic cathodic protection (cp) systems of vastly different geometries can be quantitatively interrelated through this slope parameter. It is proposed also that this same slope parameter can serve as the basis for cp system design and that this approach offers advantages compared to present and historical design practice. Lastly, it is proposed that by calculation of the slope parameter and knowledge of the anode corrosion potential the current density at local regions of an existing structure can be projected based upon potential survey data alone.
- OSTI ID:
- 83003
- Report Number(s):
- CONF-940222-; TRN: IM9533%%461
- Resource Relation:
- Conference: Corrosion 94: National Association of Corrosion Engineers (NACE) international annual conference, Baltimore, MD (United States), 28 Feb - 4 Mar 1994; Other Information: PBD: 1994; Related Information: Is Part Of Corrosion/94 conference papers; PB: 5005 p.
- Country of Publication:
- United States
- Language:
- English
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